International Reply Coupons

By now we all know that IRCs are no longer sold by the self-destructive USPS. Now that the sunspots are back (!!!) and I'm on the rig a lot more, I'm making a lot of DX contacts who accept direct QSLs. In the past, I'd enclose an IRC and a SAE and everybody's happy. Not any more.

Canada Post sells them for $6.50 each, which is extortionate: I paid $2.20 last time I bought them here in the US.

Does anyone know an equally valid alternative to sending IRCs for direct QSLs? Barring that, does anyone know where I can get IRCs?